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Drill-tool check Valve Upper/lower Kelly Cock
Upper/lower Kelly Cock
 
Kelly cock valve is a constant-open type blowoutprotection assembly in drilling tool, as well kick happens,it can be closed and prevent fluid under ground fromgushing up through the water hole in drilling column. Inwell control operation, if hose and high-pressure mani-fold is damaged, it can be replaced in safety under thevalve being closes.
Upper cock adopts left hand thread but the loweradopts right hand thread, and they are identical instructure of ball valve.
Appliances
The rated working pressure of Kelly cock valveshould be equal to the rated pressure of BOP, the ID ofcock should be larger than (or equal to) the ID of Kelly rod, Max working pressure and test pressure should betested according the requirement listed in the belowtable,Holding pressure for 3 minutes without leakage isconsidered as a qualified sealing test, appliance for cockis up to 82OC and the cock wrench should stay the avail-able/usable position.
Feature
Upper cock valve consists of valve body, upper/lower seat, ball body, rotary-block, retainer, spring andnon-metal seals etc.
Valve body is ASTM4140 forging, and the machin-ery properties after heat treatment can meet the require-ment of API Spec 7.
Valve seat and ball body are made of heat-resis-tant stainless steel with abrasion and corrosionresistance.
The valve is single direction seal, as the valve isclosed, under the co-reaction of fluid pressure underwell and pre-load spring pressure, the ball body ap-proaches to the back-seat quickly so as to create a seal.As for the sealing face of back-seat adds a PTFE non-metal ring and reduce the compact of ball body to valveseat,So that it should have more reliable performance.
The surface of the valve body stamped with visiblesign of " open" or " close' indicates the open/close stationof cock valve obviously
ܷѹ(Mpa)
ѹ(Mpa)
35
35
70
35
70
105
35
105
157.5
Parts List
Item
Component
Qty
Material
Remark
1
Handle
1
45
2
Rotary-block
1
30CrMo
3
O-Ring
1
NBR
4
Body
1
40CrMnMo
5
Spring
8
65Mn
6
Lower Seat
1
2Cr13
7
Ball
1
2Cr13
8
Lower Retainer
1
2Cr13
9
O-Ring
1
NBR
10
Upper Seat
1
2Cr13
11
Upper Retainer
1
30CrMo
12
Retainer
1
2Cr13
13
Circlip
1
65Mn
Standard
 
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